Add support for DT_MIPS_RLD_MAP2 tag.

Position Independent Executables cannot communicate with GDB using DT_MIPS_RLD_TAG.
Hence a new tag DT_MIPS_RLD_MAP2 got introduced to fix the issue.

Change-Id: I77ce3faf1ef2e121003b804ecd291abb25cfbb56
Signed-off-by: Nikola Veljkovic<Nikola.Veljkovic@imgtec.com>
diff --git a/libc/arch-mips/include/machine/elf_machdep.h b/libc/arch-mips/include/machine/elf_machdep.h
index d27d431..0aacedf 100644
--- a/libc/arch-mips/include/machine/elf_machdep.h
+++ b/libc/arch-mips/include/machine/elf_machdep.h
@@ -121,6 +121,7 @@
 #define	DT_MIPS_GOTSYM		0x70000013	/* first dynamic sym in got */
 #define DT_MIPS_HIPAGENO	0x70000014
 #define	DT_MIPS_RLD_MAP		0x70000016	/* address of loader map */
+#define DT_MIPS_RLD_MAP2	0x70000035	/* offset of loader map, used for PIE */
 
 /*
  * ELF Flags